You renew every 2 years. If your birthdate falls on an even year then you renew on even years, if it falls on an odd year then you renew on odd years. I was born in 1964 so my RN will need to be renewed on my birthday this year 2010. The exception to this is possibly your first year, if you are licensed in July this year (2010) and your birthday is December 1964, then you would have to renew in December this year then it would be good for 2 years after that.